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Children with alopecia areata should only get thyroid screening if they have Down syndrome, a family history of thyroid disease, atopy, or signs of thyroid problems.

Sunlight exposure ages hair, making it brittle, stiff, and dry.

UV radiation significantly damages hair, especially with humidity, making it more vulnerable to further damage.

Sunlight and chemical treatments change hair's internal structure differently, needing specific care.

UV radiation causes skin aging by damaging cells and triggering harmful processes.

Excessive sun exposure damages hair, causing protein loss and color changes.

UV radiation damages hair by creating holes and peeling cuticle layers.

Chemical treatments and UV radiation severely damage the lipid layer on hair.

UV exposure damages hair, increasing thiols and altering protein structure.

Heat and UV exposure damage hair structure by altering keratins.

Visible light can damage skin and most sunscreens don't block it well; more research is needed on its effects and protection methods.

Sunlight worsens hair loss; protect scalp.

Non-ablative fractional laser treatments have a low risk of side effects in Asian patients.

Visible light can improve skin disorders and hair loss, but more research is needed to understand long-term effects.

Rice bran extract boosts melanin production in hair follicles.

Early hair loss may be linked to metabolic syndrome.

Imiquimod improved skin pigmentation in most patients with xeroderma pigmentosum and may prevent further skin cancer, but some treatments can have side effects.

Hair with more melanin resists weather damage better.

Photoepilation may disrupt normal wound healing and increase the risk of scars.

Oxidation changes human hair by breaking down fats and forming new acidic groups, affecting how it interacts with conditioners and cosmetics.

Infant skin cells may be less capable of repairing UV-induced DNA damage than adult cells.

Melasma is now considered a skin aging disorder caused by sun exposure in people with a genetic tendency, which impacts treatment and prevention approaches.

UV treatment can damage hair, so protection is advised.

Photodynamic therapy can potentially remove nonpigmented hair by damaging hair follicles.

Different types of sun exposure damage skin cells and immune cells, with chronic exposure leading to more severe and lasting damage.

Permanent hair dye damages hair but it mostly recovers after 8 weeks; using certain hair care products can help repair it.

Common cosmetic dermatology techniques improve skin damaged by the sun and aging.

UV exposure severely damages hair, making it rough and weak.

Chemotherapy and radiation therapy cause skin and hair damage by altering gene expression and signaling pathways.

Photobiomodulation is effective and safe for healing injuries and improving appearance.